It was abominably rough outside the sheltered seclusion of the harbour, and he was beginning to think that ‘a willing horse’ is a synonym for a fool, when a terrific crash made the ship quake, flung him in anything but a gentle manner against the nearest handrail, and nearly burst his ear-drums. Our friend glued his eyes to the indicator, expecting it to swing round to ‘Astern’ or ‘Stop.’ The hand remained motionless. He comforted himself with the reflection that if the bow was blown to bits or the vessel sent sky-high it was none of his business. It was not his duty to interfere with the navigation of the ship, which was certainly ploughing her way through the short and choppy seas as though nothing untoward had happened.

Presently the skipper’s burly form appeared at the casemate. “What on earth was that?” asked the engineer. “Only a depth charge exploding a couple of miles away,” was the answer. “There’s lots of oil hereabouts.”

Unfortunately the Allies were not the sole possessors of the prescription for these quick-acting pills. Depth charges ‘made in Germany’ were sometimes dropped in the tracks of British submarines. A certain commander, who also knows what it is to face the ugly muzzles of 6–in. guns spitting flame when a submarine is cruising awash, confesses to a preference for the latter weapon. This is the reason why:

He came near the surface at an awkward moment. No sooner had he fixed his eyes to the periscope than he discovered that enemy torpedo-boats—not one but many—were in the immediate neighbourhood. Their movements showed them to be perfectly well aware of his presence. His orders were terse. Any hesitation in translating them into action would have meant disaster. The boat began to descend, nose foremost. She continued travelling in that direction even when it was a matter of urgent importance to maintain an even keel. Something had jammed, and jammed badly. Then there was a terrific report, followed by a concussion that did more than merely shake the submarine. Some of the crew were knocked down. No need to ask if there had been a seaquake. Everybody knew right enough what had happened, and fully realized that the shock was probably only the prelude to further episodes of a similar kind. Rivets, bolts, and plates held good—so did the beastly jam. The submarine just dived to the bottom. There the officer let her remain without any attempt to repair the trouble. Like Brer Rabbit, he believed there were occasions when it is supreme wisdom to ‘lie low’ and do nothing. This was one of them. There was no immediate haste. He appeared to be waiting for something.

The ‘something’ came three minutes later, accompanied by a deafening bang that made rich, warm blood run cold. Another depth charge had been hurled overboard. It made the submarine rock, but a careful investigation of every nook and cranny made it evident that she had not so much as sprung a leak. British shipbuilders are the finest in the world when they like, and they had liked when putting together this underwater craft. With those on board the Norah Creina the commander could say, “God bless every man that swung a mallet on that tiny and strong hull! It was not for wages only that they laboured, but to save men’s lives.”

Evidently the enemy was not quite satisfied that he had killed his prey. There was nothing on which to base a report of death. Surmise is not certainty; it withholds proof. The Germans got out their sweeps and began fishing. The imprisoned men could hear the cable scraping along their boat, and thanked God when it ceased. The wire rope got entangled in nothing. That was a big mercy.

A third depth charge was heard and felt to explode, nearer this time, but still without doing serious injury. The torpedo-boats dropped no more ground-bait after that. The submarine was “missing, believed killed.” The Germans were not fond of remaining in one spot for any considerable time. When the victim was dead or mortally wounded, there was no need to attend the funeral. There were always the grey police of the Patrol to be reckoned with.

Down below the crew of the “missing, believed killed” were straightening things out and wondering if they were to receive further attention from above. Two, four, six, eight hours passed, daylight with them. Little likelihood of the hunters being about now. Then the submarine, according to the official report, “proceeded to her base.”

Before the war I tried to puzzle out why it was that human beings, of their own free will, became firemen on a battleship. One minute in a stokehold is sixty seconds too long for most people. To me the problem remains unsolved. Are they all possessed of the steel nerves of Hotham when he was told to fight his vessel till she sank and was comforted by Duncan’s remark that he had taken the depth of the water and that when the Venerable went down his flag would still be flying? Stoking is bad enough, but what of those who volunteer for service in a submarine? They do not seem to be out of the ordinary ruck of humanity. Solve the riddle of the ‘something’ they possess and you will be able to put down in black and white, after the manner of a sum, the secret of Britain’s Sea-power.

Seemingly unconscious of the unpleasant fact that a T.B.D. was a mere mile away, a submersible broke surface, presumably to recharge her storage batteries. No sooner had she come to the top than the commander discovered the British vessel racing toward him at full tilt. If the destroyer missed a fine chance of ramming by reason of the Hun’s alertness, she certainly seized a rare opportunity for dropping a couple of depth charges. They gave the enemy a terrible shaking. No other reason would have brought the U-boat so perilously near the surface as to uncover the periscope, which appeared at an angle sufficiently rakish to show that the submarine was anything but comfortable. The T.B.D. gave her another dose. One or two other vessels appeared, anxious to render assistance with a further supply of concentrated destruction. In addition to a lavish waste of oil, there came to the surface four significant things: a calcium float, a broken steel buoy, a wooden ladder, and a lifebelt. I do not think there is the least likelihood that that particular U-boat returned to Zeebrugge or any other lair.